Grinding machine



.Ju1y24,192s. 1,677,988

' E. POLESKE ET AL.

GRINDING MACHINE Filed Jan. 14, 1928 2 sheets-sheet v1 Snowdon ,Fr/Ves foes he, Sears P0 Zes he,

July 24, 1928. 1,677,988

- E. PoLEsKE: ETAL GRINDING MACHINE Filed Jan. 14, 1928l 2 Sheets-Sheet 2 fffesZPaZes /re Sears' Palese,

Patented July 24, 1928.

ERNEST POLESKE AND` SEARS-POLEKSKE, OF MANILLA, IOWA. y

GRINDING MACHINE. "j

Application led January 14, 1928.v Serial No. 246,724.

rl`his invention relates to machines for grinding grain, feed and the like, and has more particular reference to grinding machines wherein the grinding is performed by pivoted hammers which are so mounted that they can swing back when they encounter an obstruction or a hard object.

rlhe primary object of the presentinvention is to provide improved means for plvotally mounting will be kept in spaced relation.

Another object is to provide an improved form of pivoted hammer which is light and simple in construction, and which may b e formed from a fiat bar and secured in position without the aid of separate fastening and spacing devices.

A further object is to provide a construction and -arrangement of hammers whereby a most efficient grinding operation may be had with the expenditure of a minimum amount of power.

The invention consists in the novel form,

combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawings and claimed.

In the drawings:

Figure 1 is a top plan view of a grinding machine embodying the present invention.

Figure 2 is an elevational view looking toward the left of Figure 1.

Figure 3 is a section on line 3-3 of Figure 1.

Figure 4 is an enlarged fragmentary section, showing the form of the hammers and the manner of mounting them on alternate ones of the pivot rods. Y

Figure 5 is a view somewhat similar to Figure 4, showing the manner of mounting the hammers on the remaining pivot rods;

Figure 6 is an enlarged perspective View of one of the hammers. Y

Referring more in detailgto the drawings, 5 indicates the casing or housing having an interior grinding surface 6, 7 the hopper for feeding material thereinto, 8 the bottom grate or screen having openings through which the reduced or ground material passes, and 9 the spout which leads the ground material from the machine. A shaft 10 carries end disks 11 and an intermediate polygonal plate 12 between which are pivotally mounted the ham! mers 13 on rods 14 which fit in and pass through holes in the corners of the plate 12 and have reduced ends 15 which it into openthe hammers so that theyv ings in the end disks 11. In this-way the pivot rods cannotmove through the end disks, .and the intermediate plate l12y .will

lbrace thepivotrods and act to agitato the material when the machine is operated.

f Each hammer: 13 :consists of a' flat `bar bent into J-shaped and having alined openings 16 in thespaced opposed portions thereof so that the hammer may be slipped onto the pivot bar and be free to swing thereon. The hammers are diposed on each pivot rod so that the longer leg of each hammer flatly engages the longer leg of the neXt adjacent hammerand the shorter leg of each hammer flatly engages the shorter leg of the next adjacent hammer as shown in Figures 4 and 5. The hammers are thus mounted and maintained in the desired relation without the aid of separate fastening and spacing means, and, due to the spaced rela-tion of the legs of the hammers, they will yield laterally to a desirable limited degree. The longer legs of the hammers on alternate pivot rods are staggered relative to the longer legs of the hammers on the remaining ivot rods, so as to Ijprovide for a most edicient grinding operation with minimum resistance and consumption of power. This relation is effected by placing the first or end hammers on said alternate pivot rods with their shorter legs in contact with the adjacent end disk 11 as shown in Figure 4, and placing the similar hammers on said remaining pivot rods with their longer legs in contact with the said adjacent disk 11 as shown in Figure 5.

' Minor changes may be made within the scope of the appended claims.

What we claim as new is 1. grinding machine comprising a housing having a grinding chamber, disks rotatably mounted in said chamber, pivot rods extending between said disks, a plurality of hammers pivotally mounted in contlguous relation on said pivot rods between said disks, said hammers comprising fiat J-shaped bars presenting opposed spaced portions having alined openings therein through which the pivot rods extend.

2. A grinding machine comprising a housing having a grinding chamber, disks rotatably mounted in said chamber, pivot rods extending between said disks, a plurality of hammers pivotally mounted on said pivot rods between said disks, said hammers comprising lat- J-shaped bars having alined openings in opposed spaeedrportions thereof through which the pivot rods extend, the longer leg of each hammer being flatly en'- gaged with the longer leg of the next adjacent hammer. i

3. A grinding machine comprising y a housing having a grinding chamber, disks rotatably mounted in said chamber, pivot rods extending between said disks, a pluralitv oit' hammers pvotally mounted on said pivot rods-between said disks, said hammers comprising flat J-shaped bars having alined openings in opposed spaced portions thereoit' through Which the pivot rods extend, the

I6 longer leg of each hammer -being flatly engaged With the longer leg of the neXtadi jacent hammer and thelonger legs of the hammers yon alternate ones of said pivot rods being staggered relative to the longer legs of the hammers on the remaining pivot In testimony whereof We aiiix our signaturesv ERNEST POLESKE.

SEARS POLESKE. 

